eliminate the level crossings at a cost of £1¼ million, but no work was done until the 1960s. The last improvement to infrastructure came in 1931 with the building of the North Bridge in the town centre allowing trams to cross over the River Hull avoiding the narrow Drypool Bridge. Withdrawal of tram service (1931–1945) In 1930 the electric power station on Osborne Street was closed; afterwards the electricity supply for the trams was purchased from the Hull City Corporation's own electricity supply, in 1931 the tram service to Victoria Pier was replaced with a motorbus service. In 1934 the city of Hull transport corporation entered into a cooperation agreement with East Yorkshire Motor Services (EYMS); services were divided into three areas: Hull City, its suburbs, and the surrounding countryside; revenues for services were split between the two companies irrespective of service provider – the City transport company received revenues from the city area, whilst EYMS received the revenues for service outside Hull, revenues in the suburbs were split between the two. As a consequence it became uneconomic to operate the outlying tram routes; services on most of the routes built in the 1920s were replaced by bus services. In 1936 the construction of a trolleybus system was authorised; with the exception the Hedon Road route which was replaced by a motorbus service the remaining tram routes were replaced by trolleybus operation between 1936 and 1945. The final tram ran on 30 June 1945; the journey celebrated by the tram being illuminated by 800 lights, accompanied by local grandees and with several tens of thousands of local people along the path. The Wheeler Street, Cottingham Road, Liverpool Street and Aberdeen Street depots were re-used for the trolley buses. Further extension of the trolleybus system were proposed and authorised but none were built. Trams Fifteen trams were acquired in 1898, and another thirty in 1899; these trams were open top dual deck vehicles. By 1901 one hundred trams had been acquired; 25 of these were originally trailer vehicles, intended to be pulled by powered trams, which had been later motorised. By 1915 the number of trams had reached its maximum of 180. The trams were numbered sequentially from 1 to 180. All the vehicles were 2 axle bogieless designs with the exception of the original Tram number 101 which had a double bogie. No.101 was sold in 1916 to Erith Urban